Service manual

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600-D01 Series Hydronic Heating System Service Manual - Rev. A

1. If the heater is smoking blue/white smoke

during the start up or shut down cycle:

A. Is the Fuel Solenoid functioning properly

i. Test the fuel solenoid and make sure it

engages as soon as power is put to it. Any

delay in the fuel solenoid may cause blue/

white smoke.

ii. Remove the fuel solenoid and inspect the

plunger for any damage or debris that may

interfere with the fuel shutting down.

B. Is the Nozzle Tower Damaged?

i. Inspect the area where the nozzle screws

in for cracks in the brass.

ii Remove the fuel solenoid and inspect the

plunger seat for poorly machined brass.

C. Is the Diesel Burner short cycling (turning

off and on more frequently than normal).

i. Test the control thermostat to ensure it is

operating within the proper range.

ii. Ensure someone has not turned the heater

off and on several times.

2. If the heater is smoking blue/white smoke during

the Burn Cycle:

A. Are the electrodes adjusted properly?

i. Use the gauge on the side of the diesel burner

to properly adjust the ignition electrodes.

B. Are the air bubbles in the fuel system?

i. If the fuel pump is sucking air at any point,

on the supply fuel system, the heater will

continuously puff out blue/white smoke.

C. Is the Fuel Nozzle Bad?

D. Is the Fuel Pressure Adjusted properly?

i. The fuel pressure should be 145psi

E. Is the Fuel Pump Leaking?

i. If the fuel pump is leaking it will need to be

replaced.

F. Is the Ignition Coil igniting every time?

i. An intermittent Ignition Coil will allow fuel

to spray into the combustion chamber,

without igniting it every time.

SECTION 10: TROUBLE SHOOTING

2. Blue/White Smoke

NOTE: Webasto says it is normal for there to be a short puff

of smoke after the flame has shut down, due to the nozzle tow-

er emptying the fuel out.